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Sag and Swell Detection: How to Identify Voltage Events Before They Damage Your Equipment

A voltage sag lasts less than a second. A swell might last even less. Yet either one can trip a drive, corrupt a batch process, or quietly shorten the life of sensitive equipment, and most facility teams never see it happen. That is the problem with power quality events. They come and go faster than anyone is watching. By the time equipment fails or a process resets, the disturbance that caused it is long gone, unless something was recording at the moment it happened. This guide breaks down what sags and swells actually are, what causes each one, and how sag and swell detection through a power event recorder lets you catch the evidence instead of guessing after the fact. What Counts as a Voltage Sag or Swell? The IEEE gives these events precise definitions, and the numbers matter. According to IEEE Standard 1159-2019 , a voltage sag is a decrease in RMS voltage to between 0.1 and 0.9 per unit of nominal voltage, lasting anywhere from half a cycle to one minute. A voltage swell works th...
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Building Power Monitoring: How Facility Managers Use Power Analyzers to Cut Costs and Prevent Downtime

  Pull out your last commercial electric bill and find the line item labeled "demand charge." For most facility managers, that single number is bigger than they expect, and harder to control than they'd like. According to the National Renewable Energy Laboratory (NREL) , demand charges can represent 30% to 70% of a commercial customer's total electricity bill, depending on the rate structure and how the building actually uses power. That means a single 15-minute spike, one bad afternoon where everything runs at once, can set your cost for the entire month. This is where building power monitoring earns its keep. It's not just about tracking total energy use. It's about seeing exactly when, where, and why your building hits its peaks, so you can do something about it before the bill arrives. Why Demand Charges Deserve Your Attention Total consumption tells you how much energy your building used. Demand tells the utility how hard your building hit the grid at its...
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Power Analyzers Explained: What They Measure and Why Electrical Teams Rely on Them

  Every electrical system tells a story in its waveforms, and power analyzers are the instruments that let engineers, electricians, and facility teams actually read that story instead of guessing at it. From a routine energy audit to troubleshooting a nuisance breaker trip that's been plaguing a facility for months, the right analyzer turns an invisible problem into a clear, data-backed answer.  As electrical systems get more complex more variable frequency drives, more nonlinear loads, more renewable energy tied into the grid understanding exactly what these instruments measure, and how power quality analyzers differ from basic metering, has become essential knowledge for anyone responsible for keeping power systems reliable. This guide breaks down what these tools do, what they reveal, and where they fit into a well-run electrical program. What Does a Power Analyzer Actually Measure? A power analyzer captures the core electrical parameters that determine how a system is act...
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Understanding Harmonics, Voltage Sags, and Electrical Disturbances

Stable and reliable power is crucial to the modern electrical system. Whether it's at industrial manufacturing plants and power plants, commercial buildings or data centres, a sudden blow to the electrical system can affect equipment operation, increase operational inefficiencies, and cost the company valuable time. With the increasing dependence of companies on vulnerable electronic equipment, it is more important than ever to know about the common power quality problems. Harmonics, voltage sags, and transient disturbances can be a problem and may not be detected until it has an impact on operations. This is where Power quality analyzers and advanced Power quality monitoring solutions come into the picture to find, diagnose and fix electrical performance problems. What Are Harmonics in Electrical Systems? Harmonics are electrical distortions which are generated by non-linear loads in a power system. Harmonics are commonly generated when a device is operating, such as variable f...
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